At 02:28 PM 1/17/2006 +1300, you wrote:
>This is odd.
>
>A NoClassDefFoundError means that the class named in the exception
>message *could* be found, but that something it depends on could not.
>Unfortunately, java never tells you *what* that something is.
>
>So in this case, Asaf *has* got commons-collections but doesn't have
>something that CursorableLinkedList requires.
>
I wouldn't make this assumption too fast.
>But commons-collections doesn't *have* any dependencies. It just uses
>classes provided by java 1.2.
Usually, this is the case. However, in my experience, I usually only see a
ClassNotFoundException when using reflection to load a class and the class
is not found. In most other cases, I see a NoClassDefFoundError. The
first thing to make sure of is that the class mentioned in the error
message is on the classpath. If it is, then it means what you said; a
dependency of said class is missing leading to it not being able to be
properly loaded. If it isn't, then it can mean that the class was actually
not found.
>
>Asaf: you're not trying to run this on java 1.1 are you?
>Or maybe you have multiple copies of commons-collections in your
>classpath which are at different versions?
If commons-collections is on the classpath, then it very well could be an
issue of multiple copies where at particular version is not what is
required. Or it could be a matter of the classloader hierarchy.
Jake
>
>Regards,
>
>Simon
>
>
>
>
>On Mon, 2006-01-16 at 20:04 -0500, Sandy McArthur wrote:
>> The package of the missing class should be a big clue.
>>
>> org.apache.commons.collections.CursorableLinkedList
>>
>> hrm, Commons Collections looks to be relevant.
>>
>> Also, the download page for Commons Pools gives a big hint too:
>> http://jakarta.apache.org/commons/pool/downloads.html
>>
>> On 1/16/06, Asaf Lahav <asaf.lahav@primagrid.com> wrote:
>> > I'm testing the apache generic object pool and I'm getting an exception
>which is as follows:
>> >
>> > Exception in thread "main" java.lang.NoClassDefFoundError:
>org/apache/commons/collections/CursorableLinkedList
>> >
>> > I guess I am probably missing dependencies.
>> >
>> > Would appreciate any help.
>
>
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